What would constitute skill, exactly? The several items noted above are more complex than FFXI's model of "Just hit things until they die, unless you're the tank, then cast Utsusemi/Flash/Stun once in a while." Yeah, soloing Suzaku as a Red Mage requires a certain amount of skill (in terms of writing macros and having the necessary gear, mostly), but it's hardly the focus of the game and more analogous to 0-light Yogg-Saron than 10-man Lord Jaraxxus normal mode.
I played Warhammer: Age of Reckoning for a while and the only thing that could really be called skill was knowing when to dump boiling oil on the idiot Order forces sitting outside the front gate of your keep. I'm exaggerating a bit, of course, but even PvP becomes a predictable encounter once you're familiar with each class's abilities and counters.
I even played a text-based MUD for a while. I played a Monk and all of my various skills involved typing out commands of not just what to use on whom, but also indicating where on their body to hit them. I shocked a few people by how well I was able to fight because I actually did this. Then they introduced me to a client where I could set up keybound macros and I became a force unstoppable (used the number pad to indicate parts of the body, 8 for head, 5 for the torso, etc.).
What is skill in a video game? Even people who play fighting games or RTS on a semi-pro kind of level are essentially relying on muscle memory as much as anything else. The only time player skill has a chance to show itself (or not) is when shit goes wrong. I did Heroic Pit of Saron several weeks ago in which the tank was somehow able to be gibbed in the first 5 seconds of the fight, so the Hunter and I kited Tyrannus back and forth, using aggro dumps to bounce hate. We nearly had him, too, which is rather absurd if you think about it. It probably qualifies as skill, but is it important to be able to do that? It's only long hours of soloing things that I wasn't meant to solo which taught me how to do that.
I dunno. People get into such a huff when the word "skill" appears in relation to MMOs. It's a matter of relative skill. It's a game, of course no one is expected to have the dexterity of an Olympic gymnast or the finesse of a neurosurgeon.
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